Meals, Ready to Eat" are an instant hot meal developed by the U. S. military for troops. The meal heats up when water is added to the magnesium metal tray because the chemical reaction between water and magnesium is an

answer; blank (1); /// (2)///(3)///highblank(4)//low;

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.